Attachment for holding a forage knife on a grinding machine

ABSTRACT

This invention consists of a horizontally disposed rectangular supporting plate that is suitably secured to a grinding machine having a horizontally disposed cupped grinding wheel rotated by an electric motor, the aforesaid plate having an L-shaped lever bracket adjustably secured thereto, the said bracket having a spring-loaded pressure lever hingedly secured thereto; and wheeled means of supporting and holding a forage knife while the said knife is being sharpened by the said cupped grinding wheel.

United States Patent [151 3,656,263 Jacobsen [45] Apr. 18, 1972 [541ATTACHMENT FOR HOLDING A FOREIGN PATENTS OR APPLICATIONS FORAGE KNIFE ONA GRINDING MACHINE [72] Inventor: Julius A. Jacobsen, 526 East 6thStreet,

Sioux Falls, S. Dak. 57102 [22] Filed: June 18, 1970 [21] Appl. No.:47,184

[52] U.S.Cl. ..51/238R,51/l28 [51] Int. Cl ..B24b 41/06 [58] FieldofSearch ..5l/128, 102,216, 238,239

[56] References Cited UNITED STATES PATENTS 901,059 10/1908 Ball..51/l02 UX Rogers ..51/1 22 569,539 2/1933 Germany ..5l/l02 85,9117/1920 Sweden ..51/216 Primary Examiner-Harold D. Whitehead [57]ABSTRACT This invention consists of a horizontally disposed rectangularsupporting plate that is suitably secured to a grinding machine having ahorizontally disposed cupped grinding wheel rotated by an electricmotor, the aforesaid plate having an L-shaped lever bracket adjustablysecured thereto, the said bracket having a spring-loaded pressure leverhingedly secured thereto; and wheeled means of supporting and holding aforage knife while the said knife is being sharpened by the said cuppedgrinding wheel.

2 Claims, 3 Drawing Figures PATENTEDAPR 18 I972 3,656,263

SHEETIUFS IN VEN TOR JUL IUS' A JACOBSE/V PATENTEUAPR 18 I972 SHEET 2 OF3 INVENTOR JUL/US A. JACOBSE'N PATENTEDAPR 18 I972 SHEET 3 BF 3 1NVENTOR JUL/US A JACOBSEN M IIIH This invention relates to grindingmachines; particularly, to an attachment to a grinding machine; moreparticularly, to an attachment for grinding curved forage harvesterknives.

For the benefit of those who are beginners in the art, forage is definedas food in the form of fodder for domestic animals, fodder beingcornstalks, hay, and the like. The present invention is therefore anattachment to hold a forage cutting knife while the knife is beingsharpened by the grinding machine.

It is the principal object of this invention to provide an attachmentfor holding a forage harvester knife on a grinding machine that willgrind one edge of the knife at the required bevel, one grinding beingdone by a cupped grinding wheel (stone).

Another object of this invention is to provide an attachment for holdinga forage harvester knife on a grinding machine that 'can be mounted onnearly any grinding machine having a horizontally disposed electricmotor rotating a cupped grinding wheel.

Another object of this invention is to provide an attachment for holdinga forage harvester knife on a grinding machine that contains a minimumnumber of parts.

Still another object of this invention is to provide an attachment forholding a forage harvester knife on a grinding machine, the attachmentembodying a spring-loaded pressure lever having a rubber tire thatpresses down and thus holds the edge of the knife against the grindingwheel as the knife is moved along on rollers of the attachment.

Other and further objects and advantages of this invention will appearas the reading of this specification and its appended claims proceedsand the accompanying drawings are examined in connection therewith.

In the drawings:

FIG. 1 is a pictorial view of this invention is use.

FIG. 2 is a sectional view of this invention, taken substantially alongline 2-2 of FIG. 1, and viewed in the direction indicated by the arrows.

FIG. 3 is a sectional top view of this invention, taken substantiallyalong line 3-3 of FIG. 2, and viewed in the direction indicated by thearrows.

In the several views of this invention, like parts of the invention areindicated by like reference numbers.

The reference number 5 indicates this invention in its entirety.

Directing ones attention to FIG. 1 of the accompanying drawings it willbe seen that this invention 5 consists of a rectangular supporting plate6 that is provided with a longitudinally disposed elongated opening 7for the reception of the two upwardly extending and spaced bolts 8 thatsecure the invention onto the top 9 of a grinding machine. The aforesaidelongated opening 7 also permits longitudinal adjustment of theinvention by means of the hand screw 10 whose details are not numberedfor reasons of clarity as this part of the invention will be recognizedas typical machine tool construction by those experienced in the art.

A second elongated opening 11 is located in the same aforesaidsupporting plate 6 for reception of the two spaced and upwardlyextending bolts 12 that secure the L-shaped lever bracket 13 to thesupporting plate 6. The pressure lever 14 has a free-turning rubberwheel 15 secured to the upper surface and inner end of the lever whichis mounted on a hinge 16 that is fastened by any desired means to theupper end of the vertical leg 17 of the aforesaid L-shaped lever bracket13, as one can best see by examining FIG. 2 of the accompanyingdrawings. A coil spring 18 connects the underside of the aforesaidpressure lever 14 with the aforesaid vertical leg 17 of the L-shapedlever bracket 13. A free-turning grooved pulley 19 is mounted on theupper surface of the aforesaid supporting plate 6 and directly under thealready mentioned coiled spring 18. A free-turning wheel 20 is mountedon the aforesaid supporting plate 6 just forward of the just mentionedgrooved Bulley 19 for the support of the underside of the forage knife 1that has one edge 2 resting in the grooved periphery of the aforesaidgrooved pulley 19 while the edge 23 of the knife is being sharpened bythe cupped grinding wheel 24 that is rotated by the electric motor 25.

Looking again at FIG. 1 of the accompanying drawings it will be seenthat one end of the aforesaid forage knife 21 has an extension 26 in theform of a rectangular piece of steel on one end thereof that is providedwith a rectangular flange 27 that is secured to the upper surface andone end of the extension 26. The just mentioned flange 27 overlaps theend of the often mentioned forage knife 21. The knife is provided withan opening in which one end of the L-shaped rod 28 slidably passesthrough a horizontally disposed tube 29 that is welded or otherwisesecured to the upper surface of the aforesaid extension 26. Twolongitudinally spaced square nuts 30 and a tube 31 are located on theouter end of the aforesaid L-shaped rod 28 in the manner illustrated inFIG. 1 of the drawings. This completes the construction of this novelinvention. I

Although not previously mentioned, a second hand screw 32, similar tothe aforesaid hand screw 10, is provided for the obtaining oflongitudinal adjustment of the already described pressure lever 14, aswill be understood by those experienced in the art when they haveexamined FIG. 1 of the accompanying drawings.

The way in which this novel invention is used is quite obvious to thoseexperienced in the art after they have examined FIGS. 1 and 2 of theaccompanying drawings, therefore nothing more need be said on thissubject.

This invention is subject to any and all changes and/or modificationsone may care to make in the same in so long as the changes and/ormodifications all fall within the scope and intent of the appendedclaims.

What I now claim as new and desire to secure by Letters Patent is:

1. An attachment for holding a forage knife on a grinding machine, saidattachment comprising a horizontally disposed plate having structurethereon adapted to support a forage knife that is placed on the saidattachment and held by the said attachment for the sharpening of thesaid forage knife; said structure comprising a grooved pulley rotatablysecured to said plate, against which pulley one edge of a forage knifecan rest, an L-shaped lever bracket secured to said plate by means oftwo spaced vertically disposed bolts that extend upward through openingsin said lever bracket and through an elongated opening in the saidplate; a spring loaded pressure lever hingedly secured to said leverbracket; a free turning rubber wheel secured to said pressure lever,said rubber wheel pressure down on the upper surface of the forage knifeas the knife is being sharpened; a free turning wheel secured to saidplate, said free turning wheel located forward of the said groovedpulley to support the underside of a forage knife as the same is beingsharpened.

2. The invention of claim 1, wherein both the said L-shaped leverbracket and the said horizontally disposed plate are provided with ahorizontally disposed hand screw mechanism for the purpose of providinglongitudinal adjustment of the said lever bracket and the said plate.

1. An attachment for holding a forage knife on a grinding machine, saidattachment comprising a horizontally disposed plate having structurethereon adapted to support a forage knife that is placed on the saidattachment and held by the said attachment for the sharpening of thesaid forage knife; said structure comprising a grooved pulley rotatablysecured to said plate, against which pulley one edge of a forage knifecan rest, an Lshaped lever bracket secured to said plate by means of twospaced vertically disposed bolts that extend upward through openings insaid lever bracket and through an elongated opening in the said plate; aspring loaded pressure lever hingedly secured to said lever bracket; afree turning rubber wheel secured to said pressure lever, said rubberwheel pressure down on the upper surface of the forage knife as theknife is being sharpened; a free turning wheel secured to said plate,said free turning wheel located forward of the said grooved pulley tosupport the underside of a forage knife as the same is being sharpened.2. The invention of claim 1, wherein both the said L-shaped leverbracket and the said hoRizontally disposed plate are provided with ahorizontally disposed hand screw mechanism for the purpose of providinglongitudinal adjustment of the said lever bracket and the said plate.